Where Are the Zero Magnetic Field Points Around Three Parallel Wires?

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If there are three parallel current carrying wire where are two points that magnetic field is zero? (currents and distances are equal). If the midle wire is slided x<<d what is its moving?
 
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Near 3 in region B and in near 1 in region A

I am not able to undersatnd your second question

PS Please show your work from next time onwards. We help you in doing your HW... we are not here to do your HW
 
On my question currents are same direction and distance are d. My second question is if we move middle wire (x<<d) what is motion?
 

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